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11)
Remove the A/C condenser side brackets to radiator attaching screws (Fig. 22). Separate the condenser from the radiator by lifting upward to disengage from lower mounts (Fig. 22). Allow the condenser to rest in front of radiator.
12)
Remove the upper and lower radiator hoses.

If you have a auto it may be transmission oil from the oil cooler in the radiator. Having changed the radiator may have removed the original fault but there would be still ,oil in the coolant system that is still coming out. Have the system professionally flushed by a reputable radiator shop and then have the cooler tested in the radiator.

You can try one of the industrial strength radiator cleaners like Radiator Cleaner. According to the manufacturer: "Radiator cleaner removes the dirt, grease, scale, grime & solder from the engine cooling system. Radiator cleaner is a powerful cleaning agent not only for the automobile engine but can be used for the steam tube and boiler tube etc. Radiator cleaner not only clean the clogs of the system but also keep the system in order to run for a longer period. Radiator cleaner clean the system fast easy and safely without harming any part of the cooling system."

Advanced Petro-Chemicals' website can provide you full instructions. If you are interested, please CLICK HERE

If the system fills via an expansion tank, I would recommend removing the top hose from the radiator and filling the system by pouring the coolant in through the hose until it begins to flow out of the upper radiator port. Reconnect the hose and then fill the expansion tank. That should take care of it.

CHANGING RADIATOR TO CHANGE THE RADIATOR. THE AIR CONDITIONER SYSTEM HAS TO BE DISCHARGED AT DEALERSHIP FIRST BEFORE RADIATOR CAN BE REMOVED.AND YOU HAVE TO DROP RADIATOR FROM BOTTOM OF THE CAR THE CAR HAS TO BE RAISED AND SUPPORT ON JACK STANDS.THIS PROCEDURE FOR 97 TO 2003 OLDS MOBILES.

Your car's radiator and cooling system needs to be clean to be cool. As
time goes on, your car's radiator builds solid deposits that can clog
the cooling system. A quick, inexpensive radiator flush can keep the
system in shape. It's important to change your antifreeze seasonally. Before
you start your radiator flush, make sure you have everything you need.
There's nothing worse than draining your radiator only to realize that
you need to drive to the auto store for something!What you'll
need to perform a radiator flush:

It would cost as much to repair the leak that is internal on the tank then to buy a new radiator or buy a used radiator at a salvage yard. Make sure you flush the system after you change repair or change the radiator to get all the oil out of the system. The parts store has a flush for cleaning out the system.

If your getting coolant introduced to transmission fluid or vise-versa, you need to change rad & make sure you flush both cooling system & especially transmission thoroughly a.s.a.p. before it takes out the transmission, if damage hasn't already been done.